physical chemical changes easy 2023

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes changes such as rusting, burning, and rotting.

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What happens during the process of dissolving?

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Dissolving is a physical change where a solute (like Gatorade powder) breaks down into smaller particles and spreads evenly throughout a solvent (like water) without changing its chemical structure.

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Is a change in color always a sign of a chemical change?

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No, a change in color can indicate a chemical change, but it can also occur in physical changes. For example, when ice melts, it may appear to change color due to impurities.

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What is an example of a physical change?

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Cutting paper is an example of a physical change because it alters the shape and size of the paper but does not change its chemical composition.

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What is an example of a chemical change?

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The explosion of fireworks is an example of a chemical change because it involves a chemical reaction that produces new substances and energy.

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What is the difference between a physical change and a chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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Can physical changes be reversed?

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Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible, like breaking a glass.

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Can chemical changes be reversed?

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Chemical changes are often not reversible by simple physical means. For example, burning wood cannot be reversed to get back the original wood.

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What is an example of a substance undergoing a chemical change?

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Rotting bananas undergo a chemical change due to the reactions happening inside the fruit, leading to the formation of new substances.